Blog Post: Keeping Order With Java's LinkedHashMap (With LinkedHashMap Example)

example-with-linkedhashmap.cfm

<cfscript>
	// Some dummy articles yay!
	articles = [
		{title: "I Am a Title Perhaps", publishDate: createDate(2015, 11, 08)},
		{title: "I Am a Title As Well", publishDate: createDate(2014, 08, 15)},
		{title: "I Am a Title I Think", publishDate: createDate(2014, 09, 25)},
		{title: "I Am a Title", publishDate: createDate(2013, 04, 05)},
		{title: "I Am a Title Too", publishDate: createDate(2013, 05, 17)},
		{title: "I Am a Title Also", publishDate: createDate(2013, 07, 02)}
	];
	
	LinkedHashMap = createObject("java", "java.util.LinkedHashMap");
	collection = LinkedHashMap.init();
	for (post in articles) {
		year = year(post.publishDate);
		if (!structKeyExists(collection, year)) {
			collection[year] = LinkedHashMap.init();
		}
		if (!structKeyExists(collection[year], monthAsString(month(post.publishDate)))) {
			collection[year][monthAsString(month(post.publishDate))] = [];
		}
		arrayAppend(
			collection[year][monthAsString(month(post.publishDate))],
			{"title": post.title, "date": post.publishDate}
		);
	}
	
	writeDump(collection);
</cfscript>

<cfoutput>
<cfloop item="year" collection="#collection#">
	<h4>#year#</h4>
	<cfloop item="month" collection="#collection[year]#">
		<div><strong>#month#</strong></div>
		<cfloop index="article" array="#collection[year][month]#">
		    <div>#article.title# | #dateFormat(article.date, "YYYY/MM/DD")#</div>
		</cfloop>
	</cfloop>
</cfloop>
</cfoutput>